Camera having built-in magnetic recording and reproducing apparatus including record/playback head

ABSTRACT

A camera of the present invention uses photographic film containing a magnetic information recording portion and has a magnetic head magnetically recording or reproducing data on the magnetic information recording portion when the film is transported. A rotary roller is arranged on an opposite side side of the film relative to the magnetic head, sandwiching the film therebetween to press a magnetic recording portion of film against the magnetic head. The roller is disposed near a film travelling quantity detecting member rotating linked with film travelling.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a camera with a built-in magneticrecording and reproducing apparatus, which can record photographicinformation and developing treatment in a magnetic recording portionmade of magnetic film or reproduce the recorded information.

2. Related Art Statement

In recent years, a camera with a built-in magnetic recording apparatusfor recording photographic information or the like in a magneticrecording portion made of magnetic film has been proposed.

Several kinds of structure around the magnetic recording head used inthe aforesaid magnetic recording apparatus have been proposed. Forexample, these apparatuses as disclosed in the official gazettes ofJapanese Patent Laid Open Nos. 3-168624/1991, 3-289639/1991, and PCTapplication (International patent application) No. WO-90/04202 have thestructure in which a magnetic head for magnetic recording and a pressurepad are arranged to sandwich film therebetween and face each other andthe film is pressed on the magnetic head by the pressure pad at the timeof recording.

A magnetic recording apparatus of a camera disclosed in the officialgazette of Japanese Patent Laid Open No. 3-200130/1991 has the structurewhich drives a magnetic head to an operating position at the time ofmagnetic recording.

Nevertheless, an ordinary pressure pad made of ferrite material appliedto the apparatuses disclosed in the aforesaid references has a defect inwhich the pad is easily worn away or becomes fuzzy by sliding a film endface or perforations into the pad. Further, a film's striking feature ishardening at low temperature in comparison with audio tape, so that thefeature is disadvantageous for using the pressure pad. In addition, iffilm is sandwiched and supported in this way, the film transportingforce will increase. Therefore, more electricity is used and especially,winding at low temperature becomes more difficult by increasing the filmtransporting force. As a matter of course, an electric battery isconsumed faster.

Like a camera magnetic recording apparatus described in Japanese PatentLaid Open No. 3-200130/1991, a magnetic head is is moved, so that thereliability might be lowered by cutting a lead because an electricmember is driven.

At the same time, in the aforesaid camera using photographic film havinga magnetic recording medium of photographic information, a magnetic headwhose shape has been used for a recorder is now used. The shape isapproximately a rectangular parallelopiped and long in the optical axisdirection. In the magnetic head shape, the front having a gap portion isformed as an arc surface bending in the film travelling direction.

The structure of a magnetic head which has been used will be explainedas follows. In principle, a magnetic head is made of a ring-shaped ironcore (hereinafter, core) and an operation coil wound on the core. Thecore is formed of magnetic materials including permalloy, ferrite andsendust. Required characteristics of the magnetic materials of the coreinclude:

1) high magnetic permeability,

2) high saturation magnetic flux density,

3) small holding power,

4) strong resistivity, and

5) high hardness and good processability.

An operation coil is wound on a part of the core. The core and coil arestored in a shield case. Both ends of the operation coil are connectedto a terminal, which is insulated and arranged in such a way that theterminal is projecting from the inside of the shield case to theoutside, and further connected to an external circuit by its externalprojecting terminal. Additionally, the structure of the core isdetermined also in consideration of the efficiency of the magneticcircuit.

FIGS. 38(a)-38(d) show an assembly order of a magnetic head using aformer ferrite core. A core 302 of a magnetic head 301 shown in FIG.38(c) consists of a front core 303 shown in FIG. 38(a) and a back core304 shown in FIG. 38(b). An operation coil 305 is wound on the back core304 and then, a bonding surface 303a of the ground front core 303 and abonding surface 304a of the ground back core 304 are bonded together toform a unitary structure as shown in FIG. 38(c).

At this moment, the bonding surfaces 303a and 304a stick together, sothat an air gap between the bonding surfaces is decreased as small aspossible. Then, these cores are stored in a shield case 301a as shown inFIG. 38(d) and the shield case 301a is filled with an adhesive agent orthe like to seal the cores 302 in case 301a. However, the magnetic head301 shown in FIG. 38 is composed, as a head, of two magnetic heads forrecording and for reproducing, respectively.

FIG. 39 shows flow of magnetic flux in a core 308 of a magnetic headwhen information is magnetically recorded in a magnetic recording medium307 on film 306 by a former magnetic head formed as stated above.

The core 308 is made of a strong magnetic substance, such as permalloyas stated above. When information current flows in an operation coil 309wound on the core 308, magnetic flux φc is generated and flows in thecore 308 as shown by dotted lines. In a section of the core 308 to bemagnetically recorded, a slit-like air gap portion 308a is formed.Actually, a thin metallic foil of non-magnetic substance is put in theair gap and fixed. Because magnetic resistance in a magnetic circuit ishigh in the air gap portion 308a of the core 308, the magnetic flux φcwhich is flowing in the core flows by branching out into a magnetic fluxroute φa spreading the outside of the core, a magnetic flux route φbflowing across the air gap portion 308a, and magnetic flux φe passingthough the inside of the core. Among these branched magnetic flux, themagnetic recording medium 307 of the film 306 is magnetically recordedby the magnetic flux φa. An important point in the design of the shapeof the core is how much of the magnetic flux φa is transmitted and howeffectively the magnetic flux φa is transmitted.

Therefore, the shape of the former core is approximately a square.However, in order to choose not only magnetic material of the core butalso to reduce the cross-sectional area of the core for transmittingrequired magnetic flux and leak magnetic flux φd which is not used forrecording as small as possible, it is necessary to make a size D betweenfacing parts of the core 308 long enough and to make a space enough fora coil wound on the core to increase the number of windings of the coil.Accordingly, it is unavoidable that a former core is formed into theaforesaid square shape and becomes longer in the optical axis directionlying at right angles to the travelling direction of the magneticrecording medium.

Further, film having a magnetic recording medium to be loaded in acamera is used. On the film, emulsion of silver salt is applied on asurface on a photographic lens side of base material formed of acetateor the like and a magnetic recording medium is applied on a surface of apressure plate side at the back of the base material. Thus, in order topress and bring a magnetic recording and reproducing head into contactwith a magnetic recording medium of film, it is necessary to arrange thehead at the rear of film which is put on the side of a photographer of acamera. If a magnetic head having a former core of a square-shape isarranged on the rear of film of a camera, the camera has a defect ofbecoming thicker, having difficulty in gripping, and therefore, beinghard to be operated.

Therefore, it can be proposed to make a magnetic head flat while theformer square-shaped structure is used. FIG. 40 shows the structure ofthe flat-shaped magnetic head. FIG. 41 shows the outward appearance of amagnetic head 310 having the structure shown in FIG. 40.

A core 311 of the magnetic head 310 is formed of thin U-shaped coreshaving cross-sectional areas required for transmitting specifiedmagnetic flux. A gap portion 311a required for magnetic recording iscomposed of a pair of the cores 311. An operation coil 312 is wound oneach core. The core is stored in a shield case and fixed to the case asa unit by glue. The air gap portion 311a arranged at the center of thecores 311 is formed so as to be in contact with a magnetic recordingmedium 314 on film 313. An air gap portion 311b is formed on theopposite side of the air gap portion 311a of the core 311.

In the magnetic head 310 formed in this way, when information signalcurrents flow in the two coils 312 wound on the cores 311 to produce amagnetic field, most magnetic flux originated from the N Pole side ofthe coil flows in the core 311 as shown by the dotted flux lines φc. Dueto the high magnetic reluctance of the air gap portion 311a, themagnetic flux φc flowing in the core is divided into a magnetic path ofmagnetic flux φa going by a roundabout route like an arc on the side ofthe magnetic recording medium, a magnetic path of magnetic flux φbapproaching a surface that the core faces, and a magnetic path ofmagnetic flux φe going by a roundabout route like an arc in the insideof the core in the air gap portion 311a. The aforesaid magnetic fluxreaches the S Pole side of the coil. A magnetic recording medium ismagnetically recorded by the magnetic flux φa passing through themagnetic path on the side of the aforesaid magnetic recording mediumwithin the magnetic path of the air gap portion.

Nevertheless, as shown in FIGS. 40 and 41, if a core is made to be flat,there is a problem in which not only the magnetic paths where themagnetic flux φa, φb, and φe pass become larger but also the leakmagnetic flux φd becomes larger. The leak magnetic flux φd returns tothe coil before reaching the air gap portion 311a and is not used formagnetic recording in the magnetic recording medium. Therefore, the leakmagnetic flux φd remarkably lowers the magnetic head efficiency. Theleak magnetic flux φd becomes larger when a size D1 is made to besmaller an approach to the flux φd.

As shown in FIG. 40, if the core of the magnetic head is changed to be aflat-shape while the core of the magnetic head has the former structure,the leak magnetic flux increases, so that problems are developed:specified characteristics cannot be obtained and a space for storing thecoil cannot be secured.

A magnetic head needs positioning at the rear of film when the head isloaded in a camera. It is very important that a magnetic head is made tobe a flat-shape (thin-shape) for providing a small camera.

As disclosed in the PCT application No. WO90/04202, it is known that amagnetic head is provided on film a pressure plate as a magneticrecording and reproducing head in a camera which uses photographic filmwith a magnetic information recording portion. As described in JapanesePatent Laid Open No. 3-200131/1991, it is known that a magnetic head isprovided so as to be able to retreat against a magnetic informationrecording portion of film and brought into contact with the magneticinformation recording portion only when information is recorded andreproduced.

However, in the magnetic head disclosed in the PCT application No.WO90/04202, a part of the magnetic head enters a photographic pictureplane, so that a film surface, especially in a picture plane might bedamaged. Also, in the magnetic head described in Japanese Patent LaidOpen No. 3-200131/1991, because the magnetic head is operated to touchor not touch film, a film surface might be damaged with the operation.

OBJECTS AND SUMMARY OF THE INVENTION

The first object of the present invention is to provide a camera inwhich a magnetic head is pressed on a magnetic recording medium so as tobe able to transport film smoothly with little travelling resistance onfilm and in which a pressing mechanism of a magnetic head havingexcellent wear and abrasion resistance is contained.

The second object of the present invention is to provide a small camerain which a magnetic head having structure of a flat-shaped magneticrecording and reproducing head without lowering magnetic performance iscontained and whose maneuverability is not different from that of aformer camera.

The third object of the present invention is to provide a camera inwhich a magnetic head can be prevented from being damaged by putting amagnetic head in contact with film and from being worn by touching filmperforation, and in which instability of contact on a magnetic recordingsurface of the magnetic head can be prevented.

A first camera of the present invention uses photographic film with amagnetic information recording portion and has a magnetic head whichmagnetically records or reproduces data in the magnetic informationrecording portion when the film is transported. To press the magneticrecording portion of the film on the magnetic head, a rotary roller isset on the opposite side of the magnetic head across the film. Then, theroller is arranged near film travelling quantity detecting member whichrotates linked with film travelling.

A second camera of the present invention uses photographic film with amagnetic information recording portion and has a magnetic head whichpresses on and brings the film into contact with the magneticinformation recording portion when the film is transported. The magnetichead magnetically records or reproduces data. In the magnetic head, afront core part forming a gap portion for magnetically recording andreproducing is connected to a back core part wound by a coil in whichsignal currents for magnetic recording or reproducing flow. The sideshape of the front core part and back core part is an approximatelyL-shape viewed from the travelling direction of a film sheet.

A third camera of the present invention uses photographic film with amagnetic information recording portion and has a magnetic head whichpresses on and brings the film into contact with the magneticinformation recording portion when the film is transported. The magnetichead magnetically records or reproduces data. A cover case of themagnetic head slopes in the separating direction from the film so thatat least a part except for a surface facing the magnetic informationrecording portion does not touch a photographic picture plane of thefilm on a surface facing the film.

The other characteristics and advantages of the present invention willbe apparent enough from the following explanation.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of a camera winding mechanism portion andmagnetic recording mechanism portion showing a first embodiment of thepresent invention.

FIG. 2 is a perspective view of a main part of a magnetic recordingmechanism portion when a magnetic head having other construction isloaded in a magnetic recording mechanism portion of a camera in FIG. 1.

FIG. 3 is a sectional view of a region around a rotary roller in awinding mechanism portion of a camera in FIG. 1.

FIG. 4 is a sectional view of a region around a solenoid in a magneticrecording mechanism portion and a switching lever of a camera in FIG. 1.

FIG. 5 is a transverse sectional view showing a part of a windingmechanism portion and a magnetic recording portion of a camera in FIG.1.

FIG. 6 is a perspective view showing a sprocket portion and a magneticrecording mechanism portion of a camera in a second embodiment of thepresent invention.

FIG. 7 is a transverse sectional view showing a winding mechanismportion and a magnetic recording mechanism portion of a camera in FIG.6.

FIG. 8 is a perspective view showing a winding mechanism portion of acamera of a third embodiment of the present invention.

FIG. 9 is a perspective view showing a magnetic recording mechanismportion of a camera in FIG. 8.

FIG. 10 is a sectional view of an operation state showing a rotaryroller in a magnetic recording mechanism portion of a camera in FIG. 8which is projecting over a film side.

FIG. 11 is a perspective view showing a part of a state in which amagnetic recording mechanism portion is fitted to a camera unit of acamera in FIG. 8.

FIG. 12 is a transverse sectional view showing a state in which a rotaryroller in a magnetic recording mechanism portion of a camera in FIG. 8is retreating.

FIG. 13 is a sectional view of a rotary roller in FIG. 12.

FIG. 14 is a rear elevation of a camera in which an initial data settingswitch is arranged in a camera in FIG. 8.

FIG. 15 is a block diagram showing a control portion in a camera in FIG.8.

FIG. 16A is a flowchart of a photographic sequence of a camera in FIG.8.

FIG. 16B is a flowchart of a modified example of a photographic sequencein FIG. 16A.

FIG. 17 is a perspective view of a state in which a back cover of acamera showing a fourth embodiment of the present invention is open.

FIG. 18 is a transverse sectional view in a region around a magneticrecording mechanism portion near a spool compartment of a camera in FIG.17.

FIG. 19 is a perspective view showing a core and a coil in a magnetichead showing a fifth embodiment of the present invention.

FIG. 20 is a perspective view of a magnetic head in FIG. 19.

FIG. 21 is a side view of a magnetic head in FIG. 19.

FIG. 22 is a main part enlarged sectional view of a core and a coil in amagnetic head showing a sixth embodiment of the present invention.

FIG. 23 is a perspective view of a core and a coil in a magnetic head inFIG. 22.

FIG. 24 is a perspective view of a core and a coil in the magnetic headshowing a seventh embodiment of the present invention.

FIG. 25 is a perspective view of a magnetic head in FIG. 24.

FIG. 26 is a perspective view showing a state in which a back cover of acamera incorporates a magnetic recording and reproducing head of eithera fifth, sixth or seventh embodiment.

FIG. 27 is a main part enlarged sectional view showing a magneticrecording and reproducing head portion of the camera in FIG. 26.

FIG. 28 is a front view showing a contact state of a magnetic recordingand reproducing head on a magnetic recording medium of a camera in FIG.26.

FIG. 29 is a perspective view of a magnetic recording and reproducinghead for a camera showing a eighth embodiment of the present invention.

FIG. 30 is a main part sectional view showing a state in which amagnetic head in FIG. 29 is used.

FIG. 31 is a perspective view of a magnetic recording and reproducinghead showing a ninth embodiment of the present invention.

FIG. 32 is a main part vertical section of a magnetic head in FIG. 31.

FIG. 33 is a perspective view of a magnetic recording and reproducinghead for a camera showing a tenth embodiment of the present invention.

FIG. 34 is a perspective view of a magnetic recording and reproducinghead for a camera showing an eleventh embodiment of the presentinvention.

FIG. 35 is a front view showing a state in which a magnetic head in FIG.34 is used.

FIG. 36 is a main part sectional view showing a state in which amagnetic head in a twelfth embodiment of the present invention is used.

FIG. 37 is a perspective view of a magnetic head in FIG. 36.

FIGS. 38(a) through 38(d) are perspective views showing an assemblingorder of a former magnetic head.

FIG. 39 is a diagram showing a flux flow in a core of a magnetic head ofa former shape.

FIG. 40 is a diagram showing a flux flow in a core when a formermagnetic head is formed into a flat-shape.

FIG. 41 is a perspective view of a flat-shaped magnetic head having theconstruction shown in FIG. 40.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Embodiments of the present invention will be explained making referenceto the drawings.

FIG. 1 is a perspective view of a winding mechanism portion and amagnetic recording mechanism portion of a camera showing the firstembodiment of the present invention. The camera uses photographic filmwith a magnetic information recording portion. In the camera, when thefilm is transported, the magnetic head is pressed on the magneticinformation recording portion and data can be magnetically recorded orreproduced.

The winding mechanism portion forming the camera is a known mechanismportion of a spool drive consisting of a spool portion and a sprocketportion.

As shown in FIG. 1, the spool portion comprises a motor 1 fortransporting film, a spool 2 for winding film, a pinion gear 3 fixed onan output axis of the motor 1, and reduction gear rows 4a, 4b and 4c fordriving the spool 2.

In the spool portion, film is auto-loaded by signals in a windingdriving circuit (not illustrated) or the motor 1 is driven on the basisof film transporting signals in response to photographing, so that thefilm is advanced.

The sprocket portion is formed of a driven sprocket 5 engaged with filmperforations and rotated in accordance with film transportation, asprocket axis 7 having the same axis of the sprocket 5 and rotating withthe sprocket 5 as a unit, a slit plate 6 fixed on the sprocket axis 7 asa unit, and a photo-interrupter 8 electrically detecting the rotationquantity of the sprocket 5 as pulse signals to control filmtransportation.

The upper part of the sprocket 5 is engaged with perforations and hasgear teeth arranged so that the interval between the perforations equalsthe rotation quantity. The lower part of the sprocket 5 is narrow so asnot to touch and damage an emulsion surface of film on a photographicpicture plane part. Additionally, in the part below the lower part, thesprocket axis 7 goes through an elongated hole 10a of a roller axis 10stated later and supported by a bearing 14 calked and fixed on a base15. The base 15 is screwed in a specified position of the camera unit.

The magnetic recording mechanism portion comprises the roller axis (i.e."axle") 10 fixed to a first switching lever 12 stated later, a rotaryroller 9 rotatably supported by the roller axis 10, the first switchinglever 12 rotatably supported by the base 15, a second switching lever17, an applying force torsion spring 21 of the levers 12 and 17, asolenoid 18 screwed on the base 15, a movable iron core 19, a returningspring 20 of the movable iron core 19, and a magnetic head 30 fixed on aback cover of a camera which is not illustrated.

In the camera of the present embodiment, a magnetic head having formerconstruction is used; however, a similar type of a magnetic head 201having the construction shown in FIG. 29 stated later can be loaded.

FIG. 2 is a perspective view around a magnetic recording mechanismportion in which a magnetic head 30' similar to the magnetic head 201 isloaded. The magnetic head 30' has a sloping surface 30'b slanting to thedirection being separated from film on a cover case 30'a so as not totouch a photographic picture plane portion of the film. Because the head30' is applied, a camera can be miniaturized and a film surface can beprevented from being damaged by the magnetic head.

FIG. 3 is a sectional view of the region around the sprocket axis. InFIG. 3, the rotary roller 9 is rotatably loaded in the roller axis 10and down movement of the rotary roller 9 is controlled by a camera unit11. The camera unit 11 has camera structure formed of aluminum die-castand plastic forming materials.

On a lower part of the roller axis 10, a screw part is arranged. Theroller axis 10 is fixed to a screw part with a nut 13 so as to sandwichthe first switching lever 12. In a part engaged with a sprocket axis 7of the roller axis 10, the elongated hole 10a is bored as mentionedabove, so that the rotary roller 9 can move without touching thesprocket axis 7 even when the first switching lever 12 is switched androtated around a rotary axis 23 as will be explained later.

Next, the operation of the first and second switching levers 12 and 17will be explained using FIG. 4, a sectional view of the region aroundthe solenoid and switching levers.

A supporting axis 23 having a flange 22 is calked and fixed on the base15. A sleeve-like bearing 24 is calked and fixed to the first switchinglever 12. At the same time, a sleeve-like bearing 25 is calked and fixedto the second switching lever 17. Then, the bearing 24 is rotatablyfitted into the supporting axis 23. The bearing 25 is rotatably fittedinto the bearing 24. In addition, a torsion spring 21 is inserted intothe periphery of the bearing 25.

A downward bending portion 12a is fitted to the first switching lever 12and an upward bending portion 17a is also fitted to the second switchinglever 17. Force is applied to the torsion spring 21 in the direction inwhich a spring hook of the spring 21 repels both directions. The springhook is hung between the bending portions 12a and 17a. The spring hookapplies force rotatably to the switching levers 12 and 17 (see FIG. 1).

On the second switching lever 17, two additional bending portions 17band 17c (see FIG. 1) are arranged. The bending portions 17b and 17creceive the movable iron core 19 of the solenoid 18 between them with alittle backlash. A compression spring 20 is arranged between the bendingportions 17c and 17b of the second switching lever 17 and the yolk ofthe solenoid 18 to apply force to the movable iron core 19 in theprojecting direction and the second switching lever 17 in thecounter-clockwise direction.

FIG. 5 is a transverse sectional view of the winding mechanism portionand the magnetic recording mechanism portion.

A film winding compartment 11a is provided in the camera unit 11. Filmis advanced in such a way that film 31 is wound on the spool 2 arrangedin the film winding compartment 11a. In the sectional view of FIG. 5, anapproximate position of a driving mechanism of the rotary roller 9 isperspectively illustrated to explain the operation understandably.

The magnetic head 30 is arranged on a back cover or a supporting memberof a film pressure plate (not illustrated) and correctly maintained in aspecified position by closing the back cover. FIG. 4 shows a state whenthe movable iron core 19 is sucked towards the left and the rotaryroller 9 moves to a magnetically recording and reproducing preparationposition and a magnetic recording portion of the film 31 is pressedagainst the magnetic head 30 by specified pressing force of the roller9.

The operation of the winding mechanism portion and the magneticrecording mechanism portion of the camera in this embodiment formed asstated above will be explained using FIG. 1.

The force of the spring 20 is applied to the second switching lever 17so as to rotate in the counter-clockwise direction at the time ofordinary photographing except for the time of magnetic recording. Theforce rotates the first switching lever 12 until the elongated hole 10aof the roller axis 10 touches the sprocket axis 7 through the bearing 25and the first switching lever 12. As a result, the rotary roller 9 movesback to a position 9A in FIG. 5. The film 31 moves with the position ofthe rotary roller 9. A small gap is formed between the film 31 and themagnetic head 30, so that pressing force is lost.

When photographic operation is completed and just before the film istransported, the solenoid 18 performs suction operation by makingcontact to a solenoid driving circuit (not illustrated) as preparationoperation for magnetically recording data on film. By the operation, themovable iron core 17 is sucked against the compression spring 20. Then,the second switching lever 17 is rotated in the counter clockwisedirection in FIG. 5 by the suction. Force is further applied to thetorsion spring 21 in the applying force direction and then, theswitching lever 12 is rotated in the counter-clockwise direction in FIG.4. Thus, the position of the rotary roller 9 rotates in thecounter-clockwise direction in FIG. 5 and moves to a (solid-line)position 9B. As a result, film 31 moves in the direction of pressing themagnetic head 30. At the moment, an opening is produced between theelongated hole 10a of the roller axis 10 supporting the rotary roller 9and the sprocket axis 7 and the position of the rotary roller 9 isdetermined correctly when the roller 9 is moved. In this state, filmtransportation starts and magnetic recording and reproducing is carriedout.

Although it is not illustrated in this embodiment, the position of theroller 9 which is moved by the solenoid 18 is precisely adjusted by astopper such as an eccentric pin bringing the first switching lever 12in contact with the eccentric pin whose position is previouslydetermined. In this way, the positions of the film 31 and the magnetichead 30 are precisely determined by position adjustment and dispersionof the pressed states is removed.

It is desirable that the position in which the rotary roller 9 moves formagnetic recording is a diameter of the teeth root of the drivensprocket 5 near the position to which film touches the roller to guidetravelling, because it prevents film from becoming a shape of a bambooshoot when the film is wound on the spool.

Electricity to the solenoid 18 is turned off at the end of filmtransportation. After that, the second switching lever 17 rotates in thecounter-clockwise direction by the force applied by the spring 20. Then,the rotary roller 9 rotates until the elongated hole 10a of the rolleraxis 10 comes in contact with the sprocket axis 7, and then, the roller9 is retreated. Therefore, the magnetic head 30 and the film 31 areseparated.

As stated above, frictional resistance during film transportation can bereduced by switching the pressed state between the magnetic head 30 andthe film 31. In the present embodiment, a suction type solenoid 18 isprovided as a driving source for moving the rotary roller 9. If a latchtype solenoid in which a permanent magnet and an electric magnet arecombined is used, consumed electricity during film transportation can befurther reduced.

Additionally, magnetic recording and reproducing is performed with thewinding transportation of the film 31 in this embodiment; however, asanother method, the solenoid 18 and the driving mechanism may becontrolled in such a way that once all the photographic recordinginformation is stored in memory means at photographing and magneticallyrecorded in a position corresponding to each photographic frame linkedwith rewinding of the film 31.

Next, a camera showing the second embodiment of the present inventionwill be explained. The construction of the rotary roller of the magneticrecording mechanism portion of this embodiment is different from that ofthe first embodiment. Since the other construction is the same as thatof the first embodiment, reference numerals of the other constructionwill be explained using the same numerals.

FIG. 6 is a perspective view of a sprocket portion and a magneticrecording mechanism portion viewed from the front of a camera in thesecond embodiment. On a first switching lever 37 in the magneticrecording mechanism portion of the embodiment, a first rotary roller 35and a second rotary roller 36 are arranged and an elongated hole 37b inwhich the sprocket axis 7 is inserted is bored.

FIG. 7 is a transverse sectional view of a winding mechanism and amagnetic recording mechanism portion of the camera. As shown in FIG. 7,a magnetic head 30 is arranged between two rotary rollers 35 and 36 insuch a way that the head 30 touches two rollers.

In the camera formed as mentioned above, when electricity is supplied tothe solenoid 18 for suction operation by magnetic recording preparationoperation during an operation sequence of the camera, a second switchinglever 17 rotates in the counter-clockwise direction in FIG. 7 and thefirst switching lever 37 is also rotated in the counter-clockwisedirection through the force applied by a spring 21. As a result, therotary rollers 35 and 36 rotate in the counter-clockwise direction, sothat film 31 is pressed against the magnetic head 30. When the pressingoperation is completed, film transportation starts. Then, the magneticrecording signals are transmitted to the magnetic head 30 and the film31 is magnetically recorded corresponding to a specified photographicframe. This operation may be also a magnetic reproducing process.

After the magnetic recording and reproducing is performed in this way,when specified rotation quantity is detected by rotation quantitydetecting signals of a known sprocket 5, film transportation stoppingsignals are generated. When the film transportation stops, electricityfor suction in a solenoid 18 is turned off. A movable iron core 19 whichloses magnetic suction force moves in the projecting direction by theforce applied by the spring 20. The second switching lever 17 rotates inthe clockwise direction in FIG. 6 and the rollers 35 and 36 rotate inthe clockwise direction with the rotation of the first switching lever37, as well. Then, pressing force between the film 31 and the magnetichead 30 is released.

As stated above, according to the magnetic recording mechanism portionof the camera of the embodiment, the film 31 is moved in the magnetichead direction by the aforesaid two rotary rollers. Therefore, thepressed state of the magnetic head 30 on the film surface 31 isstabilized and improper recording and reproducing operation is hard tobe produced and film is transported more smoothly.

Next, a camera showing the third embodiment will be explained usingFIGS. 8 to 16.

FIG. 8 is a perspective view of a winding mechanism portion of thecamera. FIG. 9 is a perspective view of a magnetic recording mechanismportion of the camera of the embodiment. In the magnetic recordingmechanism portion, a rotary roller portion and a magnetic head arearranged on a film transportation path between a patrone compartment anda photographic aperture part.

As shown in FIG. 8, the winding mechanism portion has the sameconstruction as that of the first embodiment. Specifically, a spoolportion of the winding mechanism portion comprises a film transportingmotor 1, a film spool 2 for winding film 31, a pinion gear 3 of themotor 1, and reduction gears 4a, 4b and 4c. The reduction gear 4c amongthe gears is engaged with a driving gear of the spool 2. The film 31 isauto-loaded by signals of winding drive circuit (not illustrated). Themotor 1 is driven on the-basis of the film transporting signalsresponding to photographing and the film 31 is transported.

A sprocket portion comprises a driven sprocket 5 engaged with filmperforations and rotated in accordance with film transportation, adriven sprocket 5A having the same axis of the sprocket 5 and rotatingwith the rotation of the sprocket 5 as an unit, a sprocket axis 7, aslit plate 6 fixed on the sprocket axis 7 as a unit, and aphoto-interrupter 8 electrically detecting transportation quantity ofeach frame by electrically detecting rotation quantity as pulse signalsfor computing and controlling auto-load transportation quantity or filmtransportation quantity when film is rewound. Also, the windingmechanism is a known spool drive mechanism.

The upper part of the sprocket 5 has gear teeth arranged so thatrotation quantity corresponds with an interval of perforations to beengaged with the perforations. The lower part of the sprocket 5 isnarrow so that a film emulation surface is not damaged by touching thesurface. Further, the part below the lower part of the sprocket axis 7is rotatably supported.

As shown in FIG. 9, on the magnetic recording mechanism portion, arotary roller 41 containing rotary contact portions 41b, 41b, which havethick diameters upward and downward, include narrow end axle parts atthe upper and lower ends. The upper and lower ends are supported by adistal end of a first operation plate 42 which works as a bearing andswitching lever. The first operation plate 42 is provided with twoelongated holes 42a and two projecting portions 42b at the center. Atthe same time, a pin 45 is calked and fixed to a base 43, which is fixedto a camera unit through the elongated hole 42a of the first operationplate 42. The first operation plate 42 is slidably supported along thebase 43.

A second operation plate 48 is slidably supported by the pins 45 on thebase 43 through elongated holes 48c provided on a vertical part 48b.Additionally, on the second operation plate 48, a fork-shaped notch partis formed in a bending part 48a. A movable iron core 49 of the solenoid51 is fitted into the notch part with a little backlash so as not to bedropped. An eccentric pin 47 for adjusting a releasing operationposition when a solenoid 51 facing the second operation plate 48 is offis provided in the camera unit. For structure, such as a base and acamera unit, the eccentric pin 47 can be rotated by a definite force butfixed by force in which the pin 47 does not rotate easily. Also, the pin47 may be fixed across a washer by a calking and fixing method.

The solenoid 51 is also fixed to structure, such as a base of a cameraunit which is not illustrated. Although the solenoid 51 sucks a movableiron core 49 by making contact, a compression spring 50 is sandwichedbetween the yolk of the solenoid 51 and bent part 48a of the secondoperation plate 48, and then, force is applied to the second operationplate 48 in the lower right direction in FIG. 9.

Spring fitting pins 42c and 48e are calked and fixed to near the centeracross two elongated pairs of holes 42a and 48c of the first operationplate 42 and the second operation plate 48 and a pulling spring 46 ishung so as to pull the operation plates 42 and 48 toward each other.

FIG. 10 is a sectional view showing an operation state in which therotary roller 41 is driven in the upper left direction in FIG. 9 and arotary roller contact portion 41b is projecting over a film side.

FIG. 11 is a perspective view of a state in which the magnetic recordingmechanism portion is fitted to a camera unit 58. The base 43 (not shownin FIG. 11) is screwed to a surface on a side of a photographic aperture58a on an outer wall of a patrone storing compartment of a camera. Anelongated hole 58c is bored in an upper surface of outer wall 58b of thepatrone compartment so as not to interfere with an operation range of anend axle part of the rotary roller 41. It is desirable to make elongatedhole 58c of a size as small as possible to prevent light entrance on afilm travelling path.

The first operation plate 42 supporting an axle part of the rotaryroller 41 which passes through the hole 58c is arranged along the uppersurface of the outer wall of the patrone compartment. A similarelongated hole is provided on the bottom of the patrone compartment soas not to interfer with the operation of the roller 41. In this way, acontact portion 41b of the roller 41 is exposed on the film travellingpath. The other driving mechanism can be arranged in positions whichcannot be seen from the outside.

FIG. 12 is a transverse sectional view showing a state in which therotary roller 41 in the magnetic recording mechanism portion isretreated.

In FIG. 12, a patrone 59 is loaded in the patrone compartment of thecamera unit 58, and the film 31 is drawn out. The rotary roller 41 isarranged in a position facing the magnetic head 30 across the film 31.The roller 41 is provided near an entrance of a film patrone 59.

Generally, in a patrone compartment, a phenomenon in which quantity ofpulling force of the film 31 is remarkably increased has occurred,because a patrone rotates around a patrone axis in the counter-clockwisedirection and fastens film 31 between a patrone entrance and camera unitstructure by frictional resistance originated by felt for shieldinglight at the patrone entrance or the like. To improve the phenomenon,the rotary roller 41 is placed near the patrone entrance from which filmis drawn to control a film position. In this embodiment, a rotary rollerwhich presses film on a magnetic head can be also used as the positioncontrol roller.

When the rotary roller 41 does not advance in the direction of magnetichead 30, that is, a camera does not record, the position of the outerdiameter of the contact portion 41b having thick diameters upward anddownward, a portion actually touching and guiding the film 31, isadjusted so that the position corresponds with a line extended from atunnel travelling path of the film 31 (see the roller position in FIG.12).

A pin 55 for supporting a pressure plate 53 and a pressure spring 54 iscalked and fixed on a back cover 56 of the camera. A moving control part58d in the film width direction of the camera unit 58 and a pressureplate rail part (not illustrated) pressed on the pressure plate 53 arearranged on and under an aperture. When the back cover in closed, a filmtravelling path is formed in such a way that a definite space, that is,a tunnel interval is kept.

Driving signals and control signals are transmitted to a signal contactpoint from the camera unit for the magnetic head 30 fixed on the backcover 56 of the camera. Thus, camera condition or film information canbe magnetically recorded and reproduced.

Generally, metal or engineering plastic used for general structureparts, such as polycarbonate resin is used as material of the rotaryroller 41. As shown in the sectional view of the roller in FIG. 13,metal material of stainless steel or the like as usual is used for theaxis part 41a. To improve the reliability of the magnetic recording onthe film 31, a roller 41 on the contact portion 41b is covered with softmaterial, for example, rubber having rubber hardness 45°-70° may beused. This case is more effective because a larger area where themagnetic head 30 touches the roller across the film 31 can be held.After the roller contact portion 41b in FIG. 13 is molded by a method,such as two color molding, the outside is ground to be used. The roller41 need not to be made by a two color molding method and may be moldedwith soft plastic. When the roller having such structure is supplied tothe cameras in the first and second embodiments or the fourth embodimentto be described later, the roller is effective to be inexpensive andmore reliable.

FIG. 15 is a block diagram of a control portion in the camera having theaforesaid magnetic recording mechanism in this embodiment.

As shown in FIG. 15, the control portion with a built-in memory 61astoring various data of photographic information, comprises a CPU 61controlling the operation of all of the control elements, a releasecircuit 62, photometry and arithmetic circuit 63, an exposure andarithmetic circuit 64, a mirror driving circuit 65, an exposure controlcircuit 66, a film transporting and driving circuit 67, a film rewindingand driving circuit 68, a film rewound quantity arithmetic circuit 69, ashutter time lag measuring circuit 70, a second time measuring circuit71, a mirror operations time measuring circuit 72, a shutter charge timemeasuring circuit 73, a film transporting time measuring circuit 74, afilm transported quantity measuring circuit 75, a film transportedquantity judging circuit 76, a solenoid driving circuit 77, and amagnetic information record driving circuit 78. FIG. 14 shows the backof a camera. An initial data setting switch 57 arranged on the backsurface specifies an ID code of a photographer and a letter codepreviously registered.

Next, a photographic sequence of this embodiment having the magneticrecording mechanism of the aforesaid formation will be explained usingthe flowchart in FIG. 16A.

In this embodiment, a contact surface portion 41b of the rotary roller41 is maintained in a position which approximately corresponds with atravelling surface of the film 31 as mentioned above, so that thetravelling load of the film 31 is stabilized and the roller 41 rotatesin accordance with the travelling of the film 31.

As shown in FIG. 16A, when a camera receives a release signal (step S1),photographic information including system information of a loaded lens,strobe and macro device and lens information is stored in a memory 61ain the camera (step S2). Successively, a range for AF (automaticfocusing) is computed and lens is driven (step S3), and data based onthe range computation is stored (step S4). Then, photometric computationis performed on the basis of the measured luminance information by lightreceiving elements in the camera (step S5). At this time, data based onthe photometric computation result is stored (step S6).

Successively, exposure control, such as aperture control and shuttercontrol is performed (step S7) and exposure data is stored (step S8). Inthe data, not only an aperture value and shutter speed are included butalso time measuring result in a camera with an operation result of ashutter time lag is included. In addition, as a result of the exposure,a photographic mode, the number of photographic frames and photographictime are stored (step S9).

Then, operations for preparing the next photography, such as shuttercharge and film transportation are conducted (step S10, 11). In the filmtransportation process, as shown in FIG. 8, pulse signals generated withthe film transportation are detected by a photo-interrupter 8 and thefilm transported quantity is computed by a transported quantitymeasuring circuit 75 and is stored in a memory element. The pulse countvalue at the time of rewinding the film corresponds to a position ofphotographic frame.

When film transportation of one frame is completed, the process advancesto a step S12, and mirror operation time, shutter operation time andrewinding time are stored in the memory.

Specifically, a shutter second time of the shutter operation time isstored as a result computed by a known method in which intervalsapplying electric currents in a first blind magnet and second blindmagnet are measured by a timer circuit. Further, as a shutter time lag,a period from a release button is pressed to the first blind magnet isoff is computed by the same method as mentioned above and a value towhich a definite period from the magnet is off to the exposure of thepicture plane end starts is added is stored.

Shutter charge, mirror operation and film transportation time aremeasured also by a known method by output of detecting means arranged ineach corresponding unit, that is, an output signal of a transportedquantity detecting means of the construction like the photo-interrupter8 and slit plate 6 in FIG. 8 of the embodiment in which a pulse isgenerated in accordance with the operation quantity (not illustrated),and a timer circuit corresponding to each signal. The data based on themeasured result is stored. The data is stored in the timing of the flowin FIG. 16A. Also, measuring computation of operation time can becarried out if a plurality of memory means are used.

Successively, in a step S13, a flag signal representing whether initialdata is recorded or not is stored. The initial data is used to record anID code of a photographer and a letter code previously registered. Asexplained in FIG. 14, a state of the switch 57 on the back of the camerais detected and set as the control flag. When film is magneticallyrecorded by the following method, it is judged whether initial data isrecorded or not by the existence of the flag signal.

Then, the process advances to a judgement process of a step S14 andcheck a film photographic end signal output from a film transportedquantity Judging circuit 76 when the number of frames which have alreadybeen transported reaches a specified number of photographic frames. Whenthe output of the photographic end signal is detected, the processadvances to a step S15 mentioned later. In a case in which thephotographic end signal is not output, the process returns to the stepS1 and pictures are successively taken.

When the process advances to the step S15, a roller pressing process isconducted. In the roller pressing process, a signal is generated fromthe CPU 61 to the solenoid driving circuit 77 and an electric current isapplied to the solenoid 51. At the time of making the solenoid 51contact, the movable iron core 49 is sucked against the spring 50. Thesecond operation plate 48 is slid in the upper left direction andoperated. At this moment, force is applied to the pulling spring 46 inthe opening direction between a projection portion 42b of the firstoperation plate 42 and the second operation plate 48. The firstoperation plate 42 moves in the upper left direction in FIG. 9 by theapplied force of the spring 46. The contact portion 41b of the rotaryroller 41 moves toward the film from the retreated position in FIG. 12so as to press the film 31 to the magnetic head 30. An aimed value isgiven to pressure force by setting the spring 46 to a certain appliedforce.

In this way, when the rotary roller 41 is advanced, the processcontinues to a step S16. Then, a control signal is supplied from the CPU61 to the rewinding and driving control circuit 68, and a rewindingmotor rotates inversely and the film 31 starts to be rewound.

When the film 31 starts to rewind, a pulse count value of thephoto-interrupter 8 counted at rewinding is counted backward. Then, filmrewound quantity and a position of each frame which has been alreadyphotographed are computed by the film rewound quantity arithmeticcircuit 69. Since the positions of a photographic picture plane and themagnetic head 30 have been known, the positions can be controlled sothat both positions coincide.

When a signal of a picture plane edge of each frame is transmitted tothe CPU 61 by the film rewound quantity arithmetic circuit 69, memorydata corresponding to each frame is read in and transmitted to themagnetic information recording and driving circuit 78. Based on thememory data, the magnetic information recording and driving circuit 78drives the magnetic head 30 and magnetically records data on the film31.

In this way, when the information of all the photographic frame is madeto be corresponded with each photographic frame, magnetic recording isperformed. When a step S17 detects the end of film rewinding, theprocess advances to a step S18 and the rotary roller is retreated andthis routine is completed.

The rotary roller retreating operation in the step S18 will be explainedin detail. First, a solenoid controlling signal is generated from theCPU 61. Then, an electric current is turned off in the solenoid drivingcircuit 77 and the suction force for the movable iron core 49 is lost.When the suction for the movable iron core 49 is released, the iron core49 loses application force to the second operation plate 48. Next, bythe application force of the springs 50 and 46, the projection portion42b of the first operation plate 42 is pressed and slidably moved in thelower right direction in FIG. 9. The rotary roller 41 is retreated froma magnetic head 30, so that pressing force to the film 31 is released.At this moment, because the second operation plate 48 stops by touchingthe eccentric pin 47 for controlling a position, the position of theroller on the first operation plate 42 is controlled as well.

The eccentric pin 47 controls the position of the rotary roller 41 whenelectricity in the solenoid 51 is turned off. To feed film forwardstably when the film is exposed, the position of the rotary roller 41when the current is shut off is very important. In addition, when themagnetic head 30 is fixed on the side of the back cover 56, the solenoid51 at the state of breaking contact is fixed in a position in whichthere is a little opening between the film 31 and the magnetic head 30and no pressing force is generated.

In this way, the roller 41 never affects film travelling except for thetime of magnetic recording and reproducing. As mentioned above, becausethe contact portion 41b of the roller 41 is positioned on a filmtravelling axis line, high stability of film travelling can bemaintained. Further, when magnetic recording and reproducing is needed,the roller 41 advances to press the magnetic head 30 or the spacebetween the magnetic head 30 and the film 31 is previously set to besmall, so that the moving quantity of the roller 41 can likewise besmall and the roller does not have a bad influence on film travellingduring the time that data is magnetically recorded and reproduced.

The camera of the third embodiment is an example in which photographicinformation is written during a rewinding operation after a specifiedphotographic frame is advanced. A modified photographic sequence ofwriting the photographic information in a modified example when a frameis advanced may be proposed.

A flowchart of the photographic sequence in the aforesaid modifiedexample is shown in FIG. 16B. The flowchart indicates a process insertedbetween process points C1 and C2 in the flowchart of the photographicsequence in FIG. 16A.

In the process of the modified example, the program advances to a stepS21 in FIG. 16B after the process in the step S9 in FIG. 16A. In thestep S21, the rotary roller 41 performs a pressing operation to pressfilm to the magnetic head 30. This process is the same as that of thestep S15 in FIG. 16A.

Then, a shutter is charged in a step S22. In a step S23, film of oneframe is transported. At the same time, photographic informationincluding a photographic mode, the number of photographic frames andphotographing time is written on the film magnetic recording portionthrough the magnetic head 30. When the transportation and writing of theinformation are completed, the process advances to a step S24 and rotaryroller retreating operation is conducted. The rotary roller retreatingoperation is the same process as that of the step S18 in FIG. 16A andmakes the rotary roller 41 retreat to a retreated position. After that,the process returns to the step S12 through the process point C2 shownin FIG. 16A. The process thereafter follows the process in FIG. 16A.However, in the process of the modified example does not execute datawriting in the steps S15, 16 and 18 in the following steps of the stepS15 in FIG. 16A.

The data writing process through the magnetic head in the step S16 inFIG. 16A and the step S23 in FIG. 16B may be read through the magnetichead in these steps as the need arises.

In the above stated embodiments and modified example, a camera having ashutter near a picture plane like a focal-plane shutter of a single-lensreflex camera is proposed. A similar type of a camera can be alsoapplied to a lens-shutter type camera. Then, it is considered to applythis invention to a lens-shutter type camera and a camera of the fourthembodiment will be explained.

FIG. 17 is a perspective view in a state showing the fourth embodimentin which a back cover of a camera is open. FIG. 18 is a transversesectional view of the region around a magnetic recording mechanismportion adjacent to a spool compartment. The camera in this embodimentcombines a rotary roller for pressing film to a magnetic head with alens shutter portion.

As shown in FIGS. 17 and 18, the magnetic recording mechanism portion ofthe camera comprises an operation plate 85 which can advance and retreatin the perpendicular direction to a film travelling surface, a rotaryroller 81 rotatably supported by a bearing part 85a of the operationplate 85, a film guide projection 83a provided in a camera unit 83, anda magnetic head 82 fixed on a back cover 86 through a magnetic headcircuit base 82a. The film guide projection 83a is arranged on a filmtravelling portion outside a film rail 83b on the side of a windingcompartment 83d of the camera unit 83. The projection 83a is projectingwithin the film travelling surface.

In the embodiment of FIG. 18, the magnetic head 82 enters into theregion between the rotary roller 81 and the projection 83a when the backcover 86 is closed and is positioned almost corresponding to theposition of the distal end of the projection 83a. The operation plate 85and the rotary roller 81 move back to retreated positions 85A and 81Awhen magnetic recording is not performed. However, in a magneticrecording operation state, the operation plate 85 and the rotary roller81 advance and move. Because the rotary roller 81 enters the filmtravelling surface, film 88 is stably held when the film is a planestate. Thus, the pressed state of the magnetic head 82 and the film 88are stabilized.

In a case of a lens-shutter camera, the camera has merit of enabling touse a space on a lens side around a picture plane freely in comparisonwith a camera of a focal-plane shutter. Therefore, the rotary roller 81and the magnetic head 82 in this embodiment can be effectively arrangedin the most suitable position for magnetic recording.

In the cameras of the first, second, third and fourth embodiments, arotary roller is provided to face a magnetic head across film andadvanced and retreated to press the film.

(1) Film travelling resistance can be remarkably reduced. Electricconsumption can be suppressed and the life of a battery can be extended.Further, it is not necessary to increase reduction ratio of windingdiameter, and winding speed can be high.

(2) Because a roller is retreated at photographing, a magnetic head isnot pressed against the film and there is no effect on a film plane atphotographing. Also, there is no mechanical problem in which magneticrecording and reproducing is not performed well, due to film basetransformation which is produced by pressing film all the time.

(3) Although a former magnetic recording mechanism made a magnetic headretreat, a magnetic head in this invention is fixed in a specified placeand a roller is advanced and retreated, so that electric reliability forcutting a wire or the like can be increased and a head angle to a filmtravelling direction can be adjusted easier by fixing the head in aspecified place.

FIGS. 19, 20, and 21 shows a camera magnetic recording and reproducinghead in the fifth embodiment of the present invention. As the same asthat of the former core, cores of a magnetic head 101 are composed of afront cores 102 and 103 facing to each other arranged so as to form anair gap portion 110, and back cores 104 and 105 on which operation coils106 and 107 are wound. The back cores 104 and 105 are arrangedperpendicularly to rear ends of the front cores 102 and 103 arrangedhorizontally. Then, the cores are formed into an unit by fitting thefront cores 102 and 103 and the back cores 104 and 105 with bondingsurfaces 108 and 109. Accordingly, the side of the front cores 102 and103 and the back cores 104 and 105 is formed into an L-shape viewed froma travelling direction of a recording medium. Also, an air gap portion111 is formed between the back cores 104 and 105. The distance betweenthe facing parts of the front cores 102 and 103 and the back cores 104and 105 is D2.

FIG. 20 shows an outward appearance of a magnetic head 101 stored in ashield case 112. In the magnetic head 101, the cores are assembled.Exterior connecting terminals 113 and 114 of the operation coilprojecting from the back of the magnetic head. The air gap portion 110is exposed under a head surface 115 consisting of arc projection partsformed at the forward center of the magnetic head 101. The head surface115 touches a magnetic recording medium on film and magnetic recordingis performed by the air gap portion 110.

FIG. 21 shows a bonding of parts of the front core 103(102) and the backcore 105(104) wound by the operation coil 7. The front core 103 (102)and the back core 105 (104) are arranged to form a vertical (reversed)L-shape. Each of the rear end surface of the front core 103(102)horizontally arranged and the lower end surface of the back core 105(104) perpendicularly arranged to the rear end surface become thebonding surface 109 (108) which is ground to be 45°, respectively. Thebonding surface is lapped until it becomes a mirror finish to reducemagnetic resistance of the bonding part as small as possible.Additionally, it is considered that each of facing areas of the bondingsurfaces 108 and 109 is made to be larger than the cross sectional areaof each core, and magnetic resistance is reduced so as to transmit moremagnetic flux. As a matter of course, even if a lapping surface is madeto be 90° and bonded with each other, the surface has no differenteffect to make the surface a flat shape from that to be 45°. However,the effect in which larger facing area is more magnetically effectiveand magnetic resistance is reduced is explained in this embodiment.Since each of the back cores 104 and 105 is shaped into an L-shapeviewed from the front, a distance D2 between the front cores 102 and 103depends on the aforesaid L-shape and leak magnetic flux can be reducedto a level in which the leak age does not cause a problem.

The object of the present invention is to form a flat-type magnetichead. If a shape of a core is made to be longer in the lengthwisedirection, the thickness of winding coil is thinned and the same numberof turns can be obtained with the same magnetomotive force of the coilcan be produced. Thus, a thinner magnetic head can be made.

FIGS. 22 and 23 show the sixth embodiment of the present invention. Inthis embodiment, a shield case is removed and only a core and anoperation coil are indicated. Specifically, FIG. 22 shows a main partsection of a core and coil forming a magnetic head 116. FIG. 23 is aperspective view of the core and coil. Between fitting surfaces of thefront cores 117 and 118, a magnetic recording air gap portion 119 fortouching a magnetic recording medium on film (not illustrated) isformed. Each shape of back cores 120 and 121 viewed from the front is anL-shape. An operation coil 122 is wound on a part of each of the cores120 and 121. Bonding surfaces formed of the rear end surfaces of thefront cores 117 and 118 and bonding surfaces formed of the lower endsurfaces of the back cores 120 and 121 are ground so that an air gap isdecreased. The thickness of the front cores 117 and 118 is made to be T2corresponding to a necessary recording track width. The thickness of theback cores 120 and 121 is made to be T1 which differs from (and isthinner than) T2.

The front of the back cores 120 and 121 is approximately an L-shape. Abonding ground surface of the back cores 120 and 121 is ground at anangle forming the same area as the area of the bonding surface of thefront cores 117 and 118. The front cores 117 and 118 are formed so thatthe width of a part T4 bending as an L-shape having the bonding surfaceof the back cores 120 and 121 is wider than the width of a part T3facing a coil 122. Because it is necessary that the back cores 120 and121 keep cross sections required for passing sufficient flux, thethickness of the back cores is thinner than that of the front cores 117and 118, and size of the width is enlarged to make the bonding surfacelarger. The front cores 117 and 118 and the back cores 120 and 121formed in this way are connected at an acute angle θ2, then, a magneticcircuit is produced.

Further, as shown in FIG. 22, the front end part of the coil 122 has asize so that it is set back from the left-hand end of air gap 119 by adistance T5 so as not to project from the air gap portion 119 of thefront cores 117 and 118. The rear end part of the coil has a size sothat it is set in from the back edge of the back cores by a distance T6so as not to project from the rear end part of core bonding surfaces 123and 124. To make such arrangement, a bonding angle θ2 and ground surfaceangle θ1 are determined.

If the magnetic head 116 is formed as mentioned above, the width of thecoil does not influence the width of the head and the magnetic head canbe a flat shape (thin shape) while a winding space of a coil is formedsufficiently large.

FIGS. 24 and 25 show a magnetic recording and reproducing head of theseventh embodiment in this invention in which magnetic recording andreproducing can be performed. FIG. 24 shows structure of a core and anOperation coil. FIG. 25 shows an outer appearance of a magnetic head 125in which the core and operation coil in FIG. 24 are stored in a case.The upper part of the head in FIG. 24 forms a magnetic recording head125A. Similar to the fifth embodiment, a side shape of front cores 126and 127 and back cores 128 and 129 are formed into an approximateL-shape. L-shaped bending parts 130 and 131 are ground to be a bondingsurface arranged at 45° with each other. Operation coils 132 and 133 arewound on parts of the back core extended in the vertical direction. Themagnetic reproducing head 125B arranged in the lower part is formed asthe same structure as that of the upper part. Only the width of areproducing air gap portion made of front cores is different from thatof the upper part. A bonding part of the reproducing head with amagnetic medium is produced by a known method.

In such structure, the shape of the magnetic head is stretched in thelengthwise direction; however, it can be a flat-shape without enlargingin the thickness direction. Therefore, the magnetic head is a veryconvenient shape for loading in a back cover of a camera.

In the fifth, sixth and seventh embodiments, a core is divided into afront core and a back core. While these cores bond together to be anL-shape, these cores are opposed as a pair of cores to form an air gap.In addition, a mono-piece type in which a front core and a back core areformed as an unit and the side shape of the unit is an approximateL-shape can also obtain the same effect.

FIGS. 26, 27 and 28 show an example in which a magnetic head having theflat-type structure shown in the fifth, sixth and seventh embodiments iscombined with a lens-shutter camera using photographic film containing amagnetic information recording medium.

A magnetic head 135 is a thin and flat type head and arranged on a backcover 141 of a camera. That is, a circuit base 135a mounting themagnetic head 135 is disposed between a film pressure plate 140 providedon the side of a back cover 141 and the back cover 141, and fixed on theback cover 141 by a screw 139. The head surface of the magnetic head 135is exposed by cutting a part of the lower portion of the film pressureplate 140. When the back cover 141 is closed, the head is arranged so asto face the outside of perforations at the lower portions of film 137which is spread over an aperture 136d on the side of a camera unit 136as shown in FIG. 27.

At the same time, a film pressing roller 134 held by a supporting arm138 is arranged to be able to go in and out in a position near a filmsupplying compartment 142 at the lower portion of the aperture 136dhaving a film rail 136b at the upper and lower ends. The roller 134 isused to press the film 137 against the magnetic head 135. For example,the roller 134 moves toward the side of back cover 141 before filmtransportation related to an exposure end signal starts and pushes thefilm 137 to be pressed on the magnetic head 135. Further, a film guidingprojection 136a having a semicircular distal end is formed in the cameraunit 136 as a unitary body in a position near the film supplyingcompartment 142.

A height of the projection 136a is almost the same as that of the filmrail 136b. The projection 136a is arranged in a symmetrical position ofthe roller 134 with respect to the magnetic head 135. When the roller134 moves to press the film, the projection 136a in cooperation with theroller 134 supports the film by two points to press the film 137 againstthe magnetic head 135.

In the magnetic head 135 arranged in this way, a film pressing roller134 moves to an operation position indicated by a solid line from aretreated position indicated by a dotted line as shown in FIG. 27 by apulse signal generated at the time of starting the film transportationof frames which finish photographing. Then, while the film 137 is pushedtoward the head 135, magnetic recording data is written by synchronizingwith the pulse signal, or a magnetic signal which has previously writtenon the film is read, and then, the data of photographic frame is stored.

When specified data is written or read and the number of counted pulsesgenerated in accordance with the film transportation quantity reaches apredetermined value, the film pressing roller 134 moves to a retreatedposition shown by a dotted line as shown in FIG. 27 and releases thepressure on film. Thus, the roller waits for the next photographingoperation.

When the magnetic head 135 is arranged in this way, the head 135 isdisposed between the film pressing roller 134 and the projection 136a.Therefore, too much load is prevented from being applied to film or amagnetic head at transporting film, and film planeness at the time offilm transportation is raised, so that film winding on a winding spoolcan be stabilized. Furthermore, if the projection 136a is replaced witha roller, load at the time of film transportation can be reduced.

As mentioned above, the use of the flat-shaped magnetic head shown inthe fifth, sixth, and seventh embodiments makes it easy to obtain aspace for loading the magnetic head in the back cover as shown in FIG.26 and a magnetic recording and reproducing apparatus can be loadedwithout increasing the thickness of a camera. A side of cores in themagnetic recording and reproducing head is formed into an L-shape bybonding a front core and a back core, so that a magnetic head can beeffectively arranged even in a small camera without lowering magneticperformance.

FIGS. 29 and 30 show a camera magnetic head of the eighth embodiment ofthe present invention.

The magnetic head in the fifth, sixth, and seventh embodiments is aflat-type and very convenient for loading in a camera. In comparisonwith a former magnetic head, necessary volume of the magnetic head isthe same but the shape of the head is thinner. Accordingly, a headsurface for magnetically recording data spreads over like a plane. Thus,as shown in FIG. 28, a pressing surface of the head to film 137 sometimecatches a part of perforations 137b or a photographic plane 137a.

If the pressing surface catches a photographic plane, there is a problemof damaging film when dust or sand enters between the film and the head.Also, because a part of the perforations is punched by a pressingmanufacturing in a film manufacturing process, complete planeness aroundthe perforations is not maintained. Therefore, unevenness around theperforations or edges intermittently bumps against the magnetic head inaccordance with film transportation, and the head is badly worn. Thus,it is a problem on durability of the head.

Further, the pressing force between the film and the magnetic headchanges with intermittent contact of unevenness or hole edges. Then, itcauses a problem in that a magnetic recording and reproducing signal isnot stabilized. In order to prevent this problem, pressing forceincreases and load at feeding film increases. As a result, a problem,such as a decline in the performance of a camera or quickly consuming abattery, is generated.

The magnetic recording and reproducing head for a camera in the eighthembodiment solves the aforesaid problem. In other words, in a magneticrecording and reproducing head 201 for a camera in the eighthembodiment, a gap portion 202c for recording and reproducing data isformed at the front part and cores 202a and 202b made of permalloy orthe like on which a coil 209a into which a recording signal current issent and a coil 209b into which a reproducing signal current is sent arewound at the rear part are stored in a cover case 203 produced by aknown method, such as a press manufacturing as shown in FIGS. 29 and 30.

In the cores 202a and 202b, a forming part of the gap portion 202c isexposed at the front center of the cover case 203 and fixed in the covercase 203 by glue filled up in the cover case 203. The exposed gapportion 202c and a band portion 203a in the horizontal direction at themiddle of the front of the case including the gap portion 202c areground to be the same plane.

The front of the case of the band portion 203a formed on the groundsurface is formed into an arc against the film travelling direction. Thecurred front of the case prevents film being caught during filmtravelling or prevents film travelling resistance from increasing due toa large bonding surface.

At the front of the magnetic head 201, an upper part and lower part ofthe band portion 203a are formed to be slopes 203b and 203c separatingfrom a photographic film surface, respectively. Specifically, the bandportion 203a is composed of parts corresponding to a forming part of thegap portion 202c of cores 202a and 202b stored in a case 203 and casesurfaces of the upper and lower parts of the band portion 203a areformed into slopes 203b and 203c retreated from the band portion 203a.

At the back of the magnetic head 201, connecting terminals 202d and 202dconnected to the coils 209a and 209b in the case 203 are projecting. Theconnecting terminals 202d and 202d are fixed to the case 203 by fillingup sealing material in the case 203.

FIG. 30 shows a state in which the magnetic head 201 of the eighthembodiment is fitted to the back cover of a camera and touches amagnetic information recording portion of film 208. That is, themagnetic head 201 is mounted on a circuit base 210, and its connectingterminals 202d and 202d are inserted into the base and soldered in aprinted circuit. Therefore, the magnetic head 201 is fitted on the base210 fixed on the back cover. When the back cover is closed, the gapportion 202c of the magnetic head 201 is arranged in a position touchingthe magnetic information recording portion magnetically coated at theback of the film 208 spread on the side of a camera unit 204.

On the side of the camera unit 204, an aperture 204a is bored at theposition of the gap portion 202c of the magnetic head 201 facing film. Afilm pressing roller 205 is projecting so as to be able to go in and outfrom the aperture 204a towards a film surface facing the magneticinformation recording portion of the film 208 which is spread. That is,the pressing roller 205 is rotatably fitted to a supporting axis 206fixed at a distal end portion of a lever 207 which is driven by apressing and driving mechanism (not illustrated) arranged in the cameraunit 204. When magnetic recording or reproducing is conducted in themagnetic information recording portion by the magnetic head 201, a partof the peripheral surface of the pressing roller 205 is projecting fromthe aperture 204a to press film surface.

In the magnetic head 201, in a state in which the back cover is closedand the gap portion 202c touches the magnetic information recordingportion of the film 208 which is spread, the slopes 203b and 203c underupper and lower parts of the gap portion 202c on the front of the covercase are separated from the film 208 as shown in FIG. 30. Then, thesurface of the cover case of the magnetic head except for a surfacetouching the magnetic information recording portion on the surfacefacing film is separated from a photographic film surface. Thus, thefront-most part of the cover case of the magnetic head does not touch aphotographic picture plane and perforations.

Accordingly, when the film 208 is transported and magnetic recording orreproducing is performed by the magnetic head 201 touching the recordingportion of the film, the front of the cover case does not touch aphotographic picture plane, and dust or sand which is inserted does notdamage a photographic picture plane. Further, inconvenience in whichedges of perforations damage durability of a magnetic head or make filmemulation come off so that the inside of a camera becomes dirty, and asa result, a camera is not smoothly operated, can be prevented.

FIGS. 31 and 32 show a magnetic head of the ninth embodiment of thepresent invention. A magnetic head 211 of the ninth embodiment is formedto be a rectangular shape along the film travelling direction. Atouching head portion 211a which is projecting forward is formed at thecenter of the magnetic head portion 211a. On the middle of the touchinghead portion 211a, a gap portion 212a formed of cores 212b and 212cstored in a cover case 213 is exposed.

At the edge of the upper surface of the cover case 213 of therectangular magnetic head 211, a slope 213a separating from aphotographic film surface is formed. The magnetic head 211 is, forexample, formed as a magnetic head for recording. In the cover case 213,a front core 212b forming the gap portion 212a and a back core 212cwound by a coil 214 are fixed to the case 213 by filling up sealingmaterial as shown in FIG. 32. At the back of the magnetic head 211,connecting terminals 215a and 215b connected to the coil 214 in the caseare projecting. The connecting terminals 215a and 215b are fixed to thecase 213 by filling up sealing material.

The magnetic head 211 of the ninth embodiment is operated in the samemanner as that of the magnetic head 201 of the eighth embodiment.

FIG. 33 shows the 10th embodiment of the present invention. A magnetichead 221 of the 10th embodiment is applied to a camera in which amagnetic information recording portion provided at the reverse surfaceof film 208 is supplied between perforations. In other words, a touchinghead portion 221a which is a lower part of the magnetic head 221 isprojecting like an arc. At the middle of the magnetic head portion 221a,a gap portion 222a formed of cores stored in a cover case 223 isexposed. Then, the gap portion 222a is pressed against the magneticinformation recording portion.

Then, an upper front part of the head 221 is sloped at 223a separatingfrom a photographic film surface. The magnetic head 221 of the 10thembodiment is operated in the same manner as that of the magnetic head201 of the eighth embodiment.

FIGS. 34 and 35 show the 11th embodiment of the present invention. Amagnetic head 231 of the 11th embodiment is made of a thin head of whicha surface facing the film 208 is rectangular shaped. At the center of acover case 233, a touching head of a rectangular shape composed of agroup of small planes is formed. At the center of the magnetic headportion 231a, a gap portion 232a formed of cores which are stored in thecover case 233 is exposed. The gap portion 232a presses against amagnetic information recording portion of the film 208. The magneticinformation recording portion is provided at an edge outside theperforations of the film 208.

The upper and lower, and right and left of the front of the case of thetouching head portion 231a is formed of slopes 231b-231f each of whichinclines toward a peripheral edge part of the case 233.

FIG. 35 shows a state in which a magnetic head 231 touches the magneticinformation recording portion of film 208. When the touching headportion 231a is pressed to the magnetic information recording portion,the slope 231b of the magnetic head 231 is separated from a film pictureplane and perforations so as not to touch them. The slope 231c isseparated from a projection of a pressure plate rail so as not to touchit. The slopes 231d and 231f escape in the travelling direction of thefilm the 208 to reduce travelling resistance and make film and magnetichead 231 contact stably. A size L0 (see FIG. 34) in the width directionof the touching head portion 231a is determined depending on a trackwidth for magnetically recording or reproducing and processed by adrawing process or the like so as to make the size larger than thethickness of the core.

FIGS. 36 and 37 show the 12th embodiment of the present invention. Theside face and a longitudinal section of a magnetic head 241 of the 12thembodiment are formed into an inverse L-shape. A touching head portion241a is an upper part of the head 241 and projecting forward. At thecenter of the touching head portion 241a, a gap portion 242a formed of acore 242b stored in a cover case 243 is exposed and pressed on amagnetic information recording portion of a film 208. The front of thetouching head portion 241a is formed like an arc in the film travellingdirection. A surface containing a gap portion 242a is ground to be aplane with the cover case. In the cover case 243, as shown in FIG. 36, afront core 242b forming the gap portion 242a and a back core 242c woundby a coil 244 are joined and fixed at a surface 242d ground at 45° tomake both cores 242b and 242 c an inverse L-shape and stored. Aconnecting terminal 245 which is projecting from the back of the head isconnected to the coil 244. These parts are fixed in the cover case 243by filling up the case with sealing material.

The cover case 243 is processed so as to be an inverse L-shape by adrawing process in accordance with the shape of the inner core. Aprojection width size L1 (seen FIG. 37) of a touching head portion 241acontaining a gap portion 242a is formed to be a size as small aspossible while the size satisfies a required track width. In thismagnetic head, such a small size makes a touched area small when thehead portion 241 touches film and makes travelling resistance decreaseand edges of perforations do not reduce the life of a head.

FIG. 36 shows a using state of the magnetic head 241 of this embodiment.The touching head portion 241a presses a magnetic information recordingportion on which the outside of the perforations 208a on a reverse sideof the film 208 are magnetically coated. In a camera unit 246, a filmrail surface 246a and a pressure plate rail surface 246b are arrangedacross an aperture 246c of a picture plane. The film rail surface 246ais a guide rail for determining a flange back of a camera. The pressureplate rail surface 246b is a guide rail for pressing a pressure plate247. A space between the pressure plate 247 and film rail surface 246ais a space for travelling the film 208 and a tunnel-like groove isproduced to support the film.

In a part of the camera unit 246 facing the magnetic head 241, theaperture 246c is bored. From the aperture 246c, a part of the filmpressing roller 248 goes in and out. The film pressing roller 248 isprevented from coming off from a supporting axis 250 fixed to asupporting plate 249 by a preventing ring and is rotatably supported.Then, the supporting plate 249 moves in the direction shown by an arrowby a moving mechanism (not illustrated) operated with filmtransportation. The film pressing roller 248 is usually located in aposition retreated from the aperture 246c. The roller 248 is exposed andmoved so as to be projecting from the aperture 246c and presses againstthe film before a signal enters a film transportation operation. Then,the magnetic information recording portion is pressed on the magnetichead 241 by a specified pressure.

The film pressing roller 248 is made of an elastic member, such as softplastic or rubber. The roller 248 can be produced without adjusting thepositions of the roller and the magnetic head and the quantity ofconnecting force finely. In addition, unevenness of recording andreproducing signals can be controlled.

If the magnetic head 241 is formed into an inverse L-shape in this wayand further formed into a flat shape, film cannot be damaged and thelife of the head can be extended. In addition, the head can be loaded inthe back cover by avoiding a projection of a pressure plate rail or afilm guiding member, so that the magnetic head can be combined in acamera without remarkably changing the shape of the camera unit.

A single-lens reflex camera in which a back cover can be freelyexchanged by a user has been sold. If such a camera is combined with aback cover having a circuit and operation part being able to performmagnetic recording by adopting the aforesaid head, there is merit inthat the film enabling to be magnetically recorded is used for theformer single-lens reflex camera to make magnetic recording possible.

In the 11th embodiment, a surface other than a magnetic informationrecording surface is formed of slopes 231b, 231c, 231d and 231f (seeFIG. 34) separating from a photographic film surface and planes.However, instead of these slopes and planes, the surface may be a partof an arc spherical surface like a touching head portion 241a as thehead 241 of the embodiment shown in FIG. 37.

According to the eighth, ninth, 10th 11th and 12th embodiments, thisinvention has an remarkable effect in which the performance of a camerais not lowered to a considerable degree and the life of a battery islengthened because there is no anxiety in that a picture plane isdamaged and film travelling resistance can be reduced. In the aforesaidembodiments, a magnetic information recording portion is providedoutside perforations of film is explained. However, a range to which themagnetic head is applied is not restricted by the explanation. Themagnetic head may be used for a type for recording data betweenperforations.

What is claimed is:
 1. A camera using photographic film containing amagnetic information recording portion, means for pressing against themagnetic information recording portion only when the film istransported, and having a magnetic head arranged to face one surface ofsaid film for magnetically recording or reproducing data,comprising:said pressing means including a rotary roller arranged toface an opposite surface of the film facing said magnetic head forpressing the magnetic information recording portion of the film againstthe magnetic head, the rotary roller arranged near a film travellingquantity detecting member rotating about a central axis responsive tofilm movement; and said roller surrounding said central axis.
 2. Acamera according to claim 1, wherein the roller is movable for aspecified moving distance in a crossing direction of film travellingtoward the travelling quantity detecting member.
 3. A camera accordingto claim 2, wherein the roller is movable between a positioncorresponding to a film travelling surface in a camera unit and aposition advancing to a side of a back cover.
 4. A camera according toclaim 1 wherein said roller is provided with an opening, said detectingmember extending through said opening, said opening being elongated toenable swingable movement of the roller without interfering withoperation of the detecting member.
 5. A camera according to claim 4wherein said roller is mounted for swingable movement upon an armpivotally mounted to rotate about a pin displaced from said centralaxis.
 6. A camera using photographic film containing a magneticinformation recording portion and being able to magnetically record orreproduce data on the magnetic information recording portion,comprising:a stationary magnetic head, fixed to a camera and arranged toface one surface of said film, for recording or reading various data onfilm having a magnetic recording portion and movable along a film feedpath; a pair of projecting means consisting of a fixed member and amovable roller for pressing the film against the magnetic head, the pairof projecting means being respectively arranged on upstream anddownstream sides of the magnetic head so as to engage the film atlocations which are respectively upstream and downstream of the magnetichead; said fixed member being fixed to a portion of the camera andprojecting toward a film arranged between a film compartment and themagnetic head, said fixed member having a circular convex surface forslidably engaging a confronting surface of the film; said roller meansbeing slidably mounted upon the camera and normally displaced from thefilm; and pressing means driving the roller means in a direction towardsaid film to press the roller means against the film.
 7. A camera usingphotographic film containing a magnetic information recording portion,magnetic means pressing against the magnetic information recordingportion when the film is transported, said magnetic means having astationary magnetic head arranged to face one surface of said film formagnetically recording or reproducing data, comprising:said pressingmeans including a pair of rotary rollers arranged to face an oppositesurface of the film relative to said magnetic head for pressing themagnetic information recording portion of the film against the magnetichead, said rollers being arranged on a common mounting means and beingon opposite sides of a film travelling quantity detecting member whichrotates responsive to film movement and being movable between a positiondisplaced from the film and a position pressing the film against themagnetic head.
 8. A camera according to claim 7 further comprising amember for mounting said rollers;means normally biasing said mountingmember for urging said rollers toward the position displaced from saidfilm and means responsive to a recording or playback initiation signalfor urging said mounting member against the force of said bias means tourge said rollers against said film.
 9. A camera using photographic filmcontaining a magnetic information recording portion, means for pressingagainst the magnetic information recording portion when the film istransported, and having a magnetic head arranged to face one surface ofsaid film for magnetically recording or reproducing data,comprising:said pressing means including a rotary roller assemblyarranged to face an opposite surface of the film facing said magnetichead for pressing the magnetic information recording portion of the filmagainst the magnetic head, the rotary roller assembly arranged adjacentto a film travelling quantity detecting member rotating responsive tofilm movement; said roller assembly comprising a pair of rollers beingprovided in upper and lower positions and movable together forrespectively touching upper and lower edges of the film; said pair ofrollers are being spaced from one another along a common shaft; meansfor moving said pair of rollers between a first position pressing saidfilm against said magnetic head and a second position displaced fromsaid first position; and eccentric means cooperating with said movingmeans for adjusting a location of said second position of said pair ofrollers to facilitate feeding of said film from a patrone during periodswhen the film is not undergoing magnetic recording or magneticreproduction.
 10. A camera according to claim 9 wherein said eccentricmeans is adjustable to adjust the second position to limit rotation of apatrone in the camera by engagement of the rollers with the film tolimit a force needed to feed film out of said patrone.
 11. A camerausing photographic film containing a magnetic information recordingportion, means for pressing against the magnetic information recordingportion when the film is transported, and having a magnetic headarranged to face one surface of said film for magnetically recording orreproducing data, comprising:said means for pressing including a rotaryroller arranged to face an opposite surface of the film facing saidmagnetic head for pressing the magnetic information recording portion ofthe film against the magnetic head, the rotary roller arranged near afilm travelling quantity detecting member rotating about a central axisresponsive to film movement; a film spool being provided for windingfilm, wherein the roller is disposed for swingable movement between thefilm spool and the film travelling quantity detecting member; and saidroller being mounted for swingable movement upon an arm pivotallymounted to rotate about a pin displaced from said central axis.
 12. Acamera according to claim 11 wherein said arm is provided with anopening, said detecting member extending through said opening, saidopening being elongated to permit movement of said arm withoutinterfering with operation of the detecting member.